/Engine/Plugins/Enterprise/DatasmithImporter/Source/DatasmithImporter/Public/ObjectElements/DatasmithUSceneElement.h
Create an array with the LightActor in the Datasmith scene that are at the root level of the hierarchy. Use RemoveLightActor to modify the Datasmith scene.
[UFUNCTION](Programming/UnrealArchitecture/Reference/Functions)(BlueprintCallable, Category="Datasmith | Scene") [TArray](API\Runtime\Core\Containers\TArray)< [UDatasmithLightActorElement](API\Plugins\DatasmithImporter\ObjectElements\UDatasmithLightActorElement) * > GetLightActors()